<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>浮动-布局</title>
    <style>
        .container{

             float: left;
            width: 960px;
            background-color: lime;

            min-height: 10px;
        }

        .top{
            height: 200px;
        }

        .nav{
            float: left;
            width: 30%;
        }

        .content{
            float: left;
            width: 70%;
        }

        .half{
            float: left;
            width: 50%;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="top">top</div>
    <div>
        <div class="nav">nav</div>
        <div class="content">content</div>
    </div>
    <div>
        <div class="half">half</div>
        <div class="half">half</div>
    </div>
</div>

</body>
</html>